Improvement in rotary paper-cutters



UNITED STATES PATENT OEETGE. A

HENRY S. MILLER, OF PHILADELPHIA, PENNSYLVANIA.

IMPROVEMENT IN ROTARY PAPER-CUTTERS.

Specification forming part of Letters Patent No. 139,176, dated May 20,1873; application file January 2d, 1873. V

.To jl whom it may concern:

B e it known that I, HENRY S. MULLER, of the city and county ofPhiladelphia and State of Pennsylvania, have invented a new and usefulImprovement in Rotary Paper-Cutters and I do hereby declare thefollowing to be a clear and exact description of the nature thereof,sufficient to enable others skilled in the art to Which my inventionappertains to fully understand, make, and use the same,`

reference being had to the accompanying drawing making part of thisspecification, in whichp Figure l is a side elevation of the deviceembodying my invention. Fig. 2 is an end or edge view thereof. Fig. 3 isa section in line .t w, Fig. l.

Similar letters of reference indicate corresponding parts in the severalfigures.

This invention consists of a circular knife formed in sections, theedges thereof being of such form as to make the ,drawcut. It alsoconsists in the blades being beveled on alternate opposite faces of thesections, whereby the knife cuts with ease, and binding thereof isovercome. -The invention also consists in so constructing thecutting-edges of the sections as to prevent ripping or tearing ot' thearticles to be cut.

Referring to the drawing, A represents the knife, consisting of a bladewhich is of circular form, and provided with a central opening for theapplication ofa mandrel, on which the knife is mounted, and by which itreceives rapid rotary motion. This blade is constructed with channels FF F.l Ff, which extend from periphery toward the center, and forni theblade into-sections or divisions B U D E, whose peripheries constitutecutting-edges a a' a a/f/ The cuttiiiged'ge a. begins at the channel Fat the point b and terminates at channel F at point c. The cutting-edgea begins at channel F at point d, and terminates at channel F at pointe, and so with the edges u." and .at/kas illustrated at f g and l1. j.The points b df h are the commencement ofthe cutting-edges of therespective sections, the knife beingproperlyrotated in the direction ofthe arrows, Fig. l, and said points are nearer to the center of theblade `than are the points c e gj, the termini of the cutting-edges; or,in other words, the com mencement of the cutting-edge of one section isbelow the termination of the edge of the adjacent section, so that theterminable points project beyond the. point-s of commencement. The sidesof the sections are beveled to form the sharp or cutting edges, and thebevels alternate or are respectively formed on opposite sides of thesection-that is tosay, the sections C E are beveled on the one or sameside, and the sectionsB D on the other side, so that there are producedtwo series of cut. ting-edges. (See Fig. 2.)

lt will be seen that as the article to be cut is advanced to the knife,or vice versa, theedges of the sections cut with a draw-cut, owing tothe increasing form of said edges, as stated, from b to 0,870.; and, asthe knife rotates with great swiftness, the various edges cut'into themass, each beveled series cut ting distinctively of each other, and yet,in the aggregate, so cutting that every part of there is no binding withthe article-a disadvantage well known in the operation of cuttingarticles of great compactness and friction, especially of numeroussheets of paper,

cork, guttapercha, Src. The particles removed from the mass till thechannels, and are thrown out from the knife during its rotation andcompletion of the cut.

Glearers may be arrangedwith the knife to assist the removal ofthecutparticles.

Having thus described my invent-ion, what I claim as new, and desire tosecure by Letters Patent, is

The rotary cutter, constructed with cuttingsections increasing in radiustoward their` heels, so as to produce a draw-cut, substantially asherein described. i l

The above signed by me this 23d day of December, 18H2.:` i

` HENRY S. MILLER. p

' VVitnesse's: A

SAMUEL G, R. HAYNEs, J oHN A. WIEDEEsHEIM.

